Electronic tube



Oct. 2, 1945. w. w. ElTEL ETAL- ELECTRONIC TUBE Filed Oct. 2, 1942 2 Sheets-Sheet l INVENTORS dw'zw 12% M F THEIR iATTORNEY Oct. 2, 1945. w. w. EITEL ETAL 2 ELECTRQN IC TUBE Filed Oct. 2, 1942 2 Sheets-Sheet 2 INVENTORS WILLIAM w. EITEL:

BY JzZK A. mi gulLaual-l THEIR ATTORNY Patented Oct. 2, 1945 61111011311, Millbrae, Calib assignors. to End- McCullough, Inc.,' San Bruno, calm. a corpora} tionof California;

Application October 2, wig-seminarians? 7 reclaims. to uen -gray";

Our invention relates to an electronic tube, and more particularly to a type in which a plural-ity of electrode groups areenclosed Witl'iin a single envelope.

It isamong the objects of our invention to proa: ditheprongs and the other-two filaments-inpu vide an improved arrangement of and moimting for-the electrodes in the envelope. g

Another object is to provide any improved supand lead. arrangement fo'r thegrids.

The inventicn' possesses other. objects and feew; and havinga lat r illy n p r n transversely creme Lead. portionl 22-- tures of advantage some of-whicn'with the fore going,'will ba -set forth in thefollowing descriptiorr of our inve'ntiont' It is to beunderstood that wedo notlimittourselves td this disclosure of? of the lattert seai I82 Cathodes n each-have a pair" of leads-" l9; air sealed- -togstem l these leads being connected to prongs 9 so thattwo of the" filaments are connected in parallel tog a pair ailel tothe-o'ther two prongs. 1 1

turned portion: 2 lwloeated axially oftheenvelope preterably slopes downwardly and is sealed tothe side portionsot the=envel ope atseall. zit-on shoaldecim- @A- terminal: button; 24a provided on the species of our invention as-we may adopt variant ldilexternal end ofthe grid-leachthereof "-withinthe scope of the bodying theimprovements of: our: invention: and

Figure-21's a vertical sectional view of the same.

In terms ofbroad inclusion, our improved tube comprises an envelope enclosing a plurality of groups of electrodes spaced about the longitudinal axis of the envelope, each group including an anode and grid and cathode. Conductor means for the anodes and grids extend through opposite ends of the envelope and a grid lead is sealed to the envelope portions intermediate the ends, the grids being unitarily supported on the single grid lead. The anodes are also preferably mounted on a common lead, and the cathode leads are preferably sealed to a stem on the envelope. We also preferably provide a shield in the envelope, interposed between the electrodes and the stem.

In greater detail, and referring to the drawings, our tube comprises an envelope of glass or the like having a cylindrical body with an enlarged upper portion 2 and a reduced lower portion 3. The latter portion is joined to a neck 4 at a shoulder 6, which neck carries a reentrant stem 1. The tube is fitted with a suitable base 8 having prongs 9.

Within the envelope are arranged a plurality of groups of electrodes, say four triode units, each including a filamentary cathode ll, grid l2 and anode l3. The electrodes in each group are coaxial; the respective axes of the groups being equally spaced about the longitudinal axis of the envelope. Anodes or plates l3 are tubular electrodes, preferably open at both ends, and carry heat radiating fins M. The anodes are preferably unitarily supported by a bracket IS on a common anode lead I! disposed axially of the envelope and extending through the upper end 55 Thepgrids. arezsupported; on the. upper end of lead portion 2 I: .bysuitableemeans, as bvcspider armsr26 radiating from the-ileadiandzsecured to.

grid terminal 2i'l-bytstrapsi28w 1 i a ln -ordertto protect stem l-uagainst heatand electron bombardment "at circular metallic. shield 291santangedttrainsverselyi.of; theenvelope be.-

tween the electrodes and the stem; .1...T11'1'S1.Shl81 is supported on the grid lead by welded joint 30.

Apertures 3| in the shield provide free passage for the cathode leads. To give full protection to the lower portions of the envelope, shield 29 is substantially co-extensive with the cross-sectional area of the envelope, the shield being pref- 30 erably cup-shaped with a flange 32 extending upwardly alongside the inner surface of the glass wall. In a tube of the particular type illustrated the envelope sections are fused together at seal 33 in reduced portion 3. Our shield 29 thus also 35 Protects this seal from heat originating at the electrodes.

We claim:

1. An electronic tube comprising an envelope having a stem, a plurality of anodes and associated grids and cathodes in the envelope, an

anode lead sealed to the envelope, means unitarily supporting the anodes on said lead, a grid lead sealed to the envelope at a point spaced from said stem, means unitarily supporting the grids on said grid lead, and leads for the oath odes sealed to said stem.

2. An electronic tube comprising an envelope, a plurality of anodes and associated grids and cathodes in the envelope, conductor means for the anodes and cathodes sealed to the envelope,

a grid lead sealed to the envelope intermediate its ends, and means unitarily supporting the grids on said grid lead, said grid lead extending inwardly from the side wall of the envelope and terminating adjacent the grids.

ELECTRONIC I I I William w; EiteL-San mundane a mediate the ends thereof, means unitarily supporting the 'gridsgon the grid'jfIeaIdfYand Ieads for the cathodes sealed 'to the'stem, said grid lead extending inwardly from the side wall of the envelope and terminating at a point above said stem.

cathodes spaced about a longitudinalgiaxis-of the envelope, an anode lead extending longi tudinally of said axis and sealed to an end of the envelope, means unitarily supporting-the anodes; 1

on said lead, conductor means for the cathodes extending into the envelope, a grid lead angularly:disposed to said axis andrsealed ;to"a, side of the envelope, andmeans unitarily supportingthe grids on said grid lead.

5.- An electronic tube comprising an envelope; a plurality of anodes and associated gridslspi rcedv about a longitudinal axis {of .the envelope, j an;

anode lead extending longitudinallyoflsaid axis and sealedto an end of the envelope, meansv unitarily supporting, the anodes on said, lead, .a

grid lead angularly disposed to said axiscand: sealed {to a side'of the envelope,'means unitarily; supporting the gridson said grid leadsaid ene; velope having a stem at the endopposite the: anode lead, cathodes associated with said anodes;

and'leads for the cathodes sealedz to the stem; 6.- An electronic tube comprising 'anenvelo'pe,

a plurality of grids and anodes and cathodes in the envelope, conductor means forthe anodes and cathodes extending intothe envelope; a"s'in-= gl grid lead'sealed to a side of thei'envelope,

and mounting meansextending from-the inner, end of the grid lead unitarily supporting the grids'on said lead; a

' the envelope, a grid lead sealed to the envelope,

means unitarily supporting the grids on said lead, leads for the cathodes sealed to the stem, and means in'the envelope for shielding the stem.

' 8; An electronic tube comprising an envelope,

\ a plurality of groups of electrodes spaced about the longitudinal axis of the envelope, each group A z-incl ,ng an anode and grid and cathode, con- 4. An electronic tube comprising an en elope,

a plurality of anodes and associate'd -grids' and{ ductor means forthe anodes and cathodes extending'through'opposite ends of the envelope, a

grid "lead having ,a section extending transversely offsaid,axisfand'seaied to the envelope porcathode and anode,leads for thecathodes sealed to the stem, conductor means forthe anodes extending into the envelope, a grid lead-sealed to the envelope, means unitarily supporting the grids on the grid lead, and a. shield supported on the grid lead and interposed between the electrodes and saidstemL; V

10. An electronic having a stem, a plurality of groups of electrodes in the envelope, ach group including a grid and cathode and anode, leadsfor the cathodesv sealed to. the stem, conductor means for the, anodes ex-& tending into the envelope, a grid lead... sealed to the envelope, means unitarily supportingthe grids on the grid lead,..and, a .shield supported on the grid lead and extending transversely of the envelope between the electrodes; and said stem, said shield having" a peripheral flangev lying adjacent the'side ,wall of the-envelope. g

- JACK- A; .McCULLOUGH.

tube comprising; an envelope 

